Jar-closure.



No. 643,908. Patented Feb. 20, I900. E. R. MEYER.

JAR CLOSURE.

(Application filed Feb. 16, 1898.)

(No Model.)

. THE No zms PETER-5 'co..' PHOTO LIYHO" WASHINGTON. D. c.

UNITED STATES PATENT OFFICE.

ERNST R. MEYER, OF DETROIT, MICHIGAN.

JAR-CLOSURE.

SPECIFICATION forming part of Letters Patent No. 643,908, dated February20, 1900. Application 1118a February 16, 1398. Serial No. 670,485. on,model.)

T0 at whom it may concern.-

Be it known that I, ERNST R. MEYER, a citizen of the United States,residing at Detroit,

in the county of Wayne and State of Michigan, have invented certain newand useful Improvements in J ar-Closures, of which the following is aspecification, reference being had therein to the accompanying drawings.

The invention consists in the construction of a closure for jarscomprising the jar proper having a shoulder independent of and below theupper edge, a packing on the shoulder, and a flange-cap fitting over theupper edge of the jar and bearing on the packing on the shoulder,together with means for drawing the cap down upon the packing, all asmore fully hereinafter described.

In the drawings, Figure l is a vertical central section through a jarembodying my invention, partly in elevation. Fig. 2 is a plan view ofthe clamping-ring. Fig. 3 is a'section through the mold, showing themanner of making the jar.

In the present state of the art fruit-jars are usually provided with arubber band laid on the top thereof, with a screw-cap fitting anexterior screw-thread on the jar and clamp ing the ring upon thejar-top. The disadvantages of this construction are well known and manyattempts have been made to overcome the same. Among others it has beenproposed to place this rubber band on the top and use a clamping-ringformed by a contractile band for drawing the cover down upon the rubberband. This has proven to be objectionable for the following reason: Inthe manufacture of the jars two-part molds are used, such as areindicated in Fig. 3 at A, B being the blowpipe upon which the gather isbrought to the mold. In the upper part of the mold is a portion 0,called the bust-0d. If the rubber band is to be placed upon the upperedge of the jar from which this bust-off is broken, the rough edgesremaining must be ground down. In grinding down quite a number of thejars are broken, and as it is done by unskilled labor the edge is notalways in the proper plane, so that when the top is clamped on one edgemay be higher than the other, and thus give an unequal pressure atdifferent points and produce a leaky closure.

My invention obviates these objections and is carried out as follows: Dis the jar, which has the bust-off flange E at the top, which may beground off or not, so far as its satisfactory results are concerned withmy con= struction. Below the top I form a rib G, the upper face of whichforms a flat shoulder F, which is formed by blowing into a groove in themold, as plainly shown in Fig. 3, and it is therefore always perfectlysmooth and true if the mold is so made. The under side of this rib hasthe inclined face H. The bust-off flange E projects slightly above thetop of this shoulder and serves as a centering-guide for the cap H,which has the downwardlyextending marginal flange I, adapted to fitfreely over the flange E and rest upon the packing-ring J on theshoulder. This cap has a recess K in its under side, or else the flangeI is of a sufficiently-greater depth than the height of the flange E, sothat there is no danger of the cap striking the flange even when thepacking is quite compressed.

The clamping-ring is preferably of sheet metal and has overlapping endsand is adapted to be drawn tightly about the upper end of the jar bymeans of the lever K. It acts to bind the cap down tight upon thepacking by means of the flexible inclined flanges L at the top andbottom edge, which bear, respectively, against the under side of the ribG (and on its inclined face H) and on the face M, preferably, also,slightly beveled on the edge of the cap. By this construction I amenabled to obtain a perfectly-tight closure and yet to manufacture thejars at a sufliciently-low price to enable me to sell them upon themarket.

What I claim as my invention is 1. In a jar-closure, a contractileclampingring formed of a sheet-metal band having overlapping ends linkedtogether by a clamping-lever to which said ends are directly connected,the hand between the points thus connected being of a length greaterthan the circumference of the jar at the closure.

2. In a jar-closure, a contractile clampingring formed of a sheet-metalband having alternating fiat portions and portions havinginwardly-inclined clamping-fingers on the edges of the band and providedwith overlapping ends linked together by a clamping lever adapted todraw said ends in opposite directions when the jar is closed.

3. In a jar-closure, a contractile clampingring formed of a flatsheet-metal band formed at intervals along its upper and lower edgeswith a series of inwardlyinclined flexible clamping fingers and havingoverlapping ends and a clamping-lever in the plane of the band to whichsaid ends are directly connected, the length of the band between saidconnections being greater than the circumference of the jar at theclosure.

4. In a jar-closure, the combination of a contractile clamping-ringformed of a sheetmetal band having ends adapted to overlap each otherwhen the jar is closed and a clamping portion intermediate between saidends provided at intervals apart with inwardlyprojecting marginalclamping-fingers adapted to press the jar and cover together atrestricted points in the circumference thereof, and a clamping-lever towhich the band is directly connected, the band between the points thusconnected being integrally of greater length than the circumference ofthe jar at the closure.

5. In a jar-closure, the combination of a contractile clamping-ringformed of a sheetmetal band with overlapping ends and a clamping portionintermediate between said ends provided at intervals along its upper andlower edge with inwardly-projecting flexible clamping-fingers adapted topress the jar and cover together at discontinuous points around thesame, and a clamping-lever directly connected to the band, the length ofthe band between the points thus connected being greater than thecircumference of the jar at the closure.

In testimony whereof I afiix my signature in presence of two witnesses.

ERNST R. MEYER.

Witnesses:

S. M. IIULBERT, M. 13. ODooHERrY.

